- 5 -
© Andigilog, Inc. 2005
www.andigilog.com
April 2006 - 70A03204
aTS75
Comparator Mode
In Comparator Mode, each time an temperature-to-
digital(T-to-D) temperature conversion occurs, the new
digital temperature is compared to the value stored in the
TOS and THYST Registers.
If a fault tolerance number of
consecutive temperature measurements are greater than
the value stored in the TOS Register, the O.S. output will be
activated. For example, if bits F1 and F0 are equal to “10”
(fault
tolerance
=
4),
four
consecutive
temperature
measurements must exceed TOS to activate the O.S.
output.
Once the O.S output is active, it will remain active
until the first time the measured temperature drops below
the temperature stored in the THYST Register.
The
operation of the alarm in Comparator Mode with fault
tolerance=2 is illustrated in Figure 1.
Interrupt Mode
In Interrupt Mode the O.S. output will first become active
after a fault tolerance number of consecutive temperature
measurements exceed the value stored in the TOS Register
(similar to Comparator Mode). Once O.S. is active, it can
only be cleared by a user read from any of the aTS75
registers (Temperature, Configuration, TOS, or THYST) or by
putting the aTS75 into Shutdown Mode (i.e., by setting the
shutdown bit in the Configuration Register to “1”).
Once
cleared, the O.S. output can only be activated again by a
fault
tolerance
number
of
consecutive
temperature
measurements that are lower than the value stored in
THYST. Again, once it is activated the O.S. output can only
be deactivated by a user read or shutdown.
Thus, in
Interrupt Mode the activate/clear cycle for O.S. has the
following
pattern:
temperature
>
TOS,
clear,
temperature < THYST, clear, temperature > TOS, clear, etc.
The operation of the alarm in Interrupt Mode with fault
tolerance=2 is also illustrated in Figure 1.
For this example:
Fault Tolerance = 2
Output Polarity = Active Low
Read (or Shutdown)
TOS
THYST
Temperature-to-Digital
Conversion
O.S. (Comparator Mode)
O.S. (Interrupt Mode)
Figure 1. Thermal Alarm Operation in Comparator and Interrupt Modes
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
